Battery capacity indicator question

Discussion in 'Prime Plug-in Charging' started by snakeshoes, Dec 21, 2019.

  1. snakeshoes

    snakeshoes Junior Member

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    New Prime owner here. I hope the forum can help me with something I can't seem to find in the manuals or via searching online thus far. When the car indicates that the EV battery is 'fully charged' via all 3 blue lights on the dash on at end of charging or via the instrument display on the dash showing "100%" and 0 time to fully charged, is the battery at true 100% capacity charge or is the Toyota software telling me 100% at a lower actual state of charge to protect battery life?

    I've been told by multiple sources that charging batteries up to full on the regular can degrade their capacity and I'm wondering if a safeguard against that has been built into the car or if I need to make sure I stop charging at 80-90% full myself.

    Thanks.
     
  2. bisco

    bisco cookie crumbler

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    it is toyota telling you it's charged as much as they allow. they have always had a buffer at the top and bottom since they started building prius.
     
  3. snakeshoes

    snakeshoes Junior Member

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    Ah, so not true state of charge of the battery but "percentage of Toyota's allowable capacity within the full size of the battery"? That makes sense. I know my Gen2 was like that but haven't been keeping up with the details of new cars since then until now.

    Thanks
     
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  4. bisco

    bisco cookie crumbler

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    the percentages have probably changed a bit, and idk if lithium allows for more or less buffer.
     
  5. Rob43

    Rob43 Senior Member

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    As @bisco said, there's a definite buffer built in. You don't need to worry about anything.

    Also if you have a 240v receptacle near your Prime, you can use your Toyota OE EVSE unit for quicker 2:28 minute charging.



    Rob43
     
  6. john1701a

    john1701a Prius Guru

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    Note the 100% on the dash is just a representation of usable capacity. The aftermarket gauge on the right shows actual capacity.



    The system is designed to always prevent overcharge and never allow deep discharge.
     
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